As Chris rightly says it's a question of correct person agreement. In this case 3rd person singular:
If the sentence had been "Vous avez compromis toute l'enquête" indeed it would have been 'avez' but as it is 'votre comportement' (your behaviour) it is- 'it' has = a compromis.
Hope this helps!
Hi Terri, let's examine the sentence more closely:
Votre comportement is the subject and "votre" is just a possessive pronount to comoportement. So the subject is third person singular. Therefore the verb needs to match this; and 3rd person singular of "avoir" is "a".
-- Chris (not a native speaker).
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